长江中下游地区内生铁铜矿床与膏盐的关系

THE RELATIONSHIP OF GYPSUM SALT BEDS WITH ENDOGENIC COPPER AND IRON ORES IN THE MIDDLE-LOWER YANGTZE VALLEY

A middle-Trlassic sequence of strata composed .of gypsumstlt beds has been reeognized in the middle-lower Yangtze Valley. The mineralization in the gypsum-salt beds is closely related to Yenshanian magmatism, During the Yenshanian, magmatic intrusion activities were very active across evaporite beds, occupying great space in gypsum-salt beds. The magmatie rocks and the alterated country rocks are characterized by alkali-eurichment and halogen-enrichment. Copper and iron ores mainly occur in the evaporite beds or overlying levels. The genesis of endogenic copper and iron ores is commonly considered to be the consequence of interaction of magma with the gypsumsalt beds, i.e. there exists a close genetic connection between evaporites, magmatism and copper-iron ores. These observed features are of great significance both in practice and theory.

A middle-Triassic sequence of strata composed of gypsumstlt beds has been re-cognized in the middle-lower Yangtze Valley. The mineralization in the gypsum-salt beds is closely related to Yenshanian magmatism. During the Yenshanian, magmatic intrusion activities were very active across evaporite beds, occupying great space in gypsum-salt beds. The magmatic rocks and the alterated country rocks are character-ized by alkali-enrichment and halogen-enrichment. Copper and iron ores mainly occur in the evaporite beds or overlying levels. The genesis of endogenic copper and iron ores is commonly considered to be the consequence of interaction of magma with the gypsum-salt beds, i.e. there exists a close genetic connection between evaporites, magmatism and copper-iron ores. These observed features are of great significance both in practice and theory.